B.P.R.D Plague of Frogs (Book) - £15.99 @ Amazon

If you've enjoyed the Hellboy films this is a really good extension of the universe, largely minus Hellboy himself. Even if you've got a start on the Hellboy series of comics, then this is a jumpstart into the spin off series (that in my opinion betters much of the Hellboy one)

It collects the first three standalone collections into a nice hardcover, so giving a decent look into the series - from memory it's 12 issues with a few mini comics thrown in.